I received the car after almost a week and they replaced the wheel bearings. After getting into the highway I immediately noticed the same noise. I thought I was mistaken so gave it a couple more days but same noise def exists: buzzing whinning noise from the rear at speeds higher than 60.
Scheduled a service appt the for repeated issue and upon doing a road test this time with a different tech the tech def agreed to the noise and mentioned he could even hear it at speeds lower than 60.
After a few days car at the service center I just got a call from my service consultant that they have decided to replace the Drive Unit to address the issue. This is a 2015 Model S 70 rear wheel with 32k miles that I purchased from Tesla. I have started doing some research immediately after and I have only seen positive posts about if something like this happen to anyone, in one case calling it a “lucky” event for your car to get a new DU. I will update once I receive the vehicle but any feedback greatly appreciated.